Dynamic For generation Problems.

[ShapeShiftme]

Line 41 crashes because myline is null or invalid.
Line 44 can crash because parentWidget() is null. If it doesn't crash for that reason then it will return null because you have not called setObjectName() on any of your widgets, so there is no widget named "myline". This will make line 45 crash.
Ditto line 47, 50, and 53.

I understand why they crashed this was more of an eample of what im trying to do do and was hoping for the correct syntax to use

Keep a pointer to the widget as a member variable and access the widget through its pointer.

Could you please give me a small example for this

If the variable is a pointer to an object then you can access its member functions using object->function() notation.

Perhaps an example for this too please.

Regards

[ChrisW67]

#include <QtGui>
#include <QDebug>
 
class MainWindow: public QMainWindow {
    Q_OBJECT
public:
    MainWindow(QWidget *p = 0): QMainWindow(p) {
        QWidget *central = new QWidget(this);   // central is a local varaibale
        label1 = new QLabel(this);  // label1 is a member variable, a pointer to a label
        label2 = new QLabel(this);
 
        QVBoxLayout *layout = new QVBoxLayout(central);
        layout->addWidget(label1);
        layout->addWidget(label2);
 
        central->setLayout(layout);
        setCentralWidget(central);
 
        doStuff();  // set starting labels
 
        connect(&timer, SIGNAL(timeout()), SLOT(doStuff()));
        timer.start(1000);  // actual object, use dot
    }
 
public slots:
    void doStuff() {
        static int count =  0;  // a local variable
        label1->setText( QString::number(count) );  // pointer to object, use ->
        label2->setText( QString::number(count * count) );
        ++count;
    }
 
private:
    // member variables
    QLabel *label1; // pointer to a QLabel instance
    QLabel *label2;
    QTimer timer;   // actual instance of a QTimer
};
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
 
    MainWindow m;
    m.show();
    return app.exec();
}
#include "main.moc"

#include <QtGui>
#include <QDebug>

class MainWindow: public QMainWindow {
    Q_OBJECT
public:
    MainWindow(QWidget *p = 0): QMainWindow(p) {
        QWidget *central = new QWidget(this);   // central is a local varaibale
        label1 = new QLabel(this);  // label1 is a member variable, a pointer to a label
        label2 = new QLabel(this);

        QVBoxLayout *layout = new QVBoxLayout(central);
        layout->addWidget(label1);
        layout->addWidget(label2);

        central->setLayout(layout);
        setCentralWidget(central);

        doStuff();  // set starting labels

        connect(&timer, SIGNAL(timeout()), SLOT(doStuff()));
        timer.start(1000);  // actual object, use dot
    }

public slots:
    void doStuff() {
        static int count =  0;  // a local variable
        label1->setText( QString::number(count) );  // pointer to object, use ->
        label2->setText( QString::number(count * count) );
        ++count;
    }

private:
    // member variables
    QLabel *label1; // pointer to a QLabel instance
    QLabel *label2;
    QTimer timer;   // actual instance of a QTimer
};

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    MainWindow m;
    m.show();
    return app.exec();
}
#include "main.moc"

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[ShapeShiftme]

That for the code. but all that i can do.

What i need to do is create the form dynamically but from your code you know how many input boxes are created.

In theory im might have 30 to create so i would like to loop them in creating and that i dont know how to reference them in this case.

for example i want to create 5 lineedits.

int i;
    for(i=1;i<=5;i++)
    {
       QLineEdit *myline;
       myline = new QLineEdit;
       myline->setText("Text " + QString::number(i));
       myhoz->addWidget(myline);
    }

int i;
    for(i=1;i<=5;i++)
    {
       QLineEdit *myline;
       myline = new QLineEdit;
       myline->setText("Text " + QString::number(i));
       myhoz->addWidget(myline);
    }

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now i KNOW this WONT work but this is what i want to do but i would not know how to do it.

Then what i would like to do is be able to reference the objects from another function.

Am i making myself clear at all
regards